STOCK-BASED COMPENSATION - Recognized Compensation Expense (Details) - Stock Options - 2008 Plan - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total gross compensation expense	$ 106	$ 138	$ 374	$ 765
Total tax benefit associated with compensation expense	4	7	20	43
Total net compensation expense	102	$ 131	354	$ 722
Total gross unrecognized compensation expense
Six months ending December 31, 2018	87		87
2019	136		136
2020	16		16
2021	0		0
Tax benefit associated with unrecognized compensation expense
Six months ending December 31, 2018	4		4
2019	11		11
2020	4		4
2021	0		0
Total net unrecognized compensation expense
Six months ending December 31, 2018	83		83
2019	125		125
2020	12		12
2021	$ 0		$ 0